Abstract
Three-phase imbalance is a long-term issue existing in low-voltage distribution networks (LVDNs), which consequently has an inverse impact on the safe and optimal operation of LVDNs. Recently, the increasing integration of single-phase distributed generations (DGs) and flexible loads has increased the probability of imbalance occurrence in LVDNs. To overcome the above challenges, this paper proposes a novel methodology based on the concept of “Active Asymmetry Energy-Absorbing (AAEA)” utilizing loads with a back-to-back converter, denoted as “AAEA Unit” in this paper. AAEA Units are deployed and coordinated to actively absorb asymmetry power among three phases for imbalance mitigation in LVDNs based on the high-precision, high-accuracy, and real-time distribution-level phasor measurement unit (D-PMU) data acquisition system and the 5th generation mobile networks (5G) communication channels. Furthermore, the control scheme of the proposed method includes three control units. Specifically, the positive-sequence control unit is designed to maintain the voltage of the DC-capacitor of the back-to-back converter. Likewise, the negative-sequence and zero-sequence control units are expected to mitigate the imbalanced current components. A simple imbalanced LVDN is modeled and tested in Simulink/Matlab (MathWorks, US). The obtained results demonstrate the effectiveness of the proposed methodology.
Highlights
Despite low-voltage distribution network (LVDN) planning with balanced consideration at the design stage, in practice, all single-phase loads have nonlinear characteristics, and such a dynamic load behavior of consumers leads to the three-phase asymmetry [1]
In view of the aforementioned survey concerning the challenge of the three-phase imbalance in the LVDN, we present a novel methodology based on the concept of “Active Asymmetry Energy-Absorbing (AAEA)” utilizing the load with a back-to-back converter, namely, “AAEA Unit”, to overcome and effectively mitigate the three-phase imbalance
A two-level coordination control methodology driven by distributionlevel phasor measurement unit (D-PMU) and 5th generation mobile networks (5G) communication technology is proposed to alleviate the three-phase imbalance in the LVDN
Summary
Despite low-voltage distribution network (LVDN) planning with balanced consideration at the design stage, in practice, all single-phase loads have nonlinear characteristics, and such a dynamic load behavior of consumers leads to the three-phase asymmetry [1]. In view of the aforementioned survey concerning the challenge of the three-phase imbalance in the LVDN, we present a novel methodology based on the concept of “Active Asymmetry Energy-Absorbing (AAEA)” utilizing the load with a back-to-back converter, namely, “AAEA Unit”, to overcome and effectively mitigate the three-phase imbalance. Considering that the compensation capacity of an AAEA Unit is limited, the two-level coordination control scheme integrated with distribution-level phasor measurement units (D-PMU) and the 5th generation mobile networks (5G) communication link is presented for imbalance mitigation for several reasons: (1) There are many imbalance points in the LVDN, the widely installed low-cost D-PMUs are deployed to monitor the imbalanced situation within the whole LVDN for coordination control, (2) D-PMU is used for accurate topology identification and line parameter estimation, which remain challenging tasks in the LVDN.
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